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POLYMERIZATION OF METHYL-METHACRYLATE WITH TERT-BUTYLLITHIUM AND TRIISOBUTYLALUMINUM IN TOLUENE - MECHANISM OF INITIATION AND TERMINATION BY MATRIX-ASSISTED LASER-DESORPTION IONIZATION TIME-OF-FLIGHT MASS-SPECTROMETRY (MALDI TOF MS)
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UNSPECIFIED (1995) POLYMERIZATION OF METHYL-METHACRYLATE WITH TERT-BUTYLLITHIUM AND TRIISOBUTYLALUMINUM IN TOLUENE - MECHANISM OF INITIATION AND TERMINATION BY MATRIX-ASSISTED LASER-DESORPTION IONIZATION TIME-OF-FLIGHT MASS-SPECTROMETRY (MALDI TOF MS). MACROMOLECULAR RAPID COMMUNICATIONS, 16 (10). pp. 725-732. ISSN 1022-1336.
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Abstract
The polymerisation of methyl methacrylate (MMA) using triisobutylaluminium/tert-butyllithium in hydrocarbon at 0 degrees C and -78 degrees C has been investigated by matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI TOF MS). Although the system gives extremely good control over molecular weight and narrow molecular weight distribution, initiation of polymerization can be complicated by formation of small amounts of tert-butyl isoprenyl ketone (1), and termination of polymerization can occur by end cyclisation of the end unit of 3. Both complications in initiation and termination can be avoided by suitable reaction conditions. Incorporation of 1 is suppressed by increasing the alkylaluminium content and by higher temperature. Termination by cyclisation has been found to occur over much longer time scales than propagation and can therefore be avoided by controlled termination after the appropriate reaction time.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Journal or Publication Title: | MACROMOLECULAR RAPID COMMUNICATIONS | ||||
Publisher: | HUTHIG & WEPF VERLAG | ||||
ISSN: | 1022-1336 | ||||
Official Date: | October 1995 | ||||
Dates: |
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Volume: | 16 | ||||
Number: | 10 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 725-732 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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